Pressure-reducing device



Aug' 9 1927' .1. o. CARREY FREssURE REDUCING DEVICE Filed May 22, 1923 2 Sheets-Sheet 1 Aug. 9, 1927. 1.638,110

J. o. CARREY v PRESSURE REDUCING DEVICE Filed May 22. 1923 2 Sheetswneet 2 jle/z idf" fa/m d. ar/zy,

Patented Aug. 9, 1927.

UNITED STATES JOHN O. CARREY, 0F ST. LOUIS, MISSOURI,

ASSIGNOR T0 CARREY-MORSE ENGINEER- ING COMPANY, OF ST. LO`UIS, MISSOURI, CORPORATION 0F MISSOURI.

PRESSURE-REDUCING DEVICE.

I Application led May 22,

This invention relates to new and useful improvements in pressure reducing devices,

and the objects of the invention are to provide a simple and eiicient device adapted to establish communication between the high pressure side and the low pressure side of a fluid pressure system and to provide a device of the class described which is of simple and durable construction, automat-ic in its action, and can be manufactured at low cost.

Further objects of the invention are to provide a valve adapted to close the high pressure inlet and to provide a pressure operated diaphragm for controlling said valve and closing said high pressure inlet at the appropriate time.

Still further objects of the invention are to provide means for regulating the operation of said valve and an improved means for sealing the access to said adjusting means and said diaphragm.

With these and other objects in view, my inventionconsists in certain novel features of construction and arrangement of parts herein after more fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is a vertical cross section through the device. f

Figure 2 is ahorizontal cross section taken on line 2-2 of Figurel.

Figure 3 is a horizontal cross section taken on line 3-3 of Figure 1.

Figure 4 is a vertical section through a modified form of the pressure reducing dev1ce.

Figure 5. is an enlarged sectional detail view of the valve operating mechanism of the device.

Figure 6 is a horizontal section line 6-6 of Figure 4.

Figure 7 is an enlarged perspective view` of the adjustable valve stem supporting taken on member.

Figure 8 is an enlarged perspective view of the valve stem.

Figure 9 is an enlarged perspective view of the valve stem locking member.l

The pressure reducing device disclosed in this application is particularly designed for use in connection wlth refrigerating systems, but is eually as well adaptable for use in any iui pressure system. p Referring by numerals to the accompanying drawings, 10 vindicates a housing in the 1923. Serial No'. 640,633.

form of an inverted truncated cone, the lower end of which is closedby a yielding wallor diaphragm 11. The upper vend is formed with an outwardly presented circular flange 12 to which vis secured an annular iange 14 of a diaphragm 15 which closes the upper end of housing 10. A convex plate 16 is arranged above diaphragm 15 and spaced therefrom, and the edge thereof is folded over flangesv y12 and 14 as indicated lalt-17 and serves to form an air-tight-seal.

'I he inturned edge 17 may be secured in position on housing 10 in any suitable manner and preferably by soldering, as indicated at 18.

.A highpressure chamber 19 is formed by diaphragm 15 and plate 16 and. an intermediate chamber 20 is formed in housing 10 by diaphragms or yieldingvwalls 11 and 15. A circular housing 21 is secured to the lower end of housing 10 and has formed therein a receiving chamber 22. Leading into this chamber is a high pressure inlet connection 24 having a ball valve 25 which is designed to close the communication between the inlet connection 24 and chamber 22 when pressure in chamber 19 reaches a predetermined degree.

A sleeve 26 is disposed in chamber 20 of housing 10 and the ends of said-sleeve i are secured to diaphragms 11 and 15. This sleeve is internally threaded for'the reception of a threaded stem 27, the lower end of which is reduced in diameter as indicated at 28 and'is adapted to bear on ball valve 25. Stem 27 is provided with a longitudinal boie or opening 29, the upper end of which communicates with chamber 19 and the lower end of which opens into the receiving chamber 22. The stem 27 is adjustable in sleeve 1"' formed in plate 16 in alignment with said stem. The opening is preferably formed by means of a tubular section 3l which is in position thereon by having its ends crimped against said plate. Sleeve 31 is provided with an interior thread in which is screw-seated ,a plug 32. This plug is provided with" iin'verted cup-shaped member 34 liavingfsigel; 35 of lead or other suitable materialiarranged therein so that when the plug is'screwed in position the upper end of tubular section 31 is forced into the gasket `35 and seals chamber 19 to the atmosphere.

In the operation of the device, the inlet.

connection 24 is connected to' the high pressure side of the fluid system and the outletl connection 23 is connecten' to the low pressure side of the system. The fluid is admitted under high pressure through connection 24 into the receiving chamber 22 unscating ball 25 from its seat in inlet connection 24. A portion of the fluid passes through bore 29 into the high pressure chamber 19. lNhen the pressure in chamber 19 reaches a predetermined degree,- diaphragm 15 is caused to move inwardly thereby forcing stem 27 downwardly so that the lower end of extension 28 forces ball 25 against its seat, thereby closing the communication between the inlet connect-ion 24 and receiving chamber 22. The fluid contained in receiving chamber 22 is discharged through outlet connection 23 and the fluid contained in chamber 19 is drained therefrom through bore 29 into the receiving chamber 22. When the pressure in chamber 19 falls below a predetermined degree diaphragm 15 moves to its normal position causing sleeve 26 and stem 27 to move upwardly thereby moving the lower end of extension 28 away from ball 25. As soon as extension 28 is moved out of contact with ball 25 the pressure in the inlet connection 24 will again unseat ball 25 thus permitting fluid to flow into the receiving chamber 22 and repeating the cycle of operation just described.

The wall 11 is yielding so as to 'permit the longitudinal movement of sleeve 26 and stem 27 when diaphragm 15 is operated and the diameter of this wall 11 is proportionately. small relative to the diameter of diaphragm 15 so that the pressure exerted in chamber 19 against diaphragm 15 issuliicient to overv come the pressure exerted'against diaphragm 11 in chamber 22. Intermediate chamber 20 in housing 10 is preferably filled with fluid under pressure which is sufficient to strengthen diaphragms 11 and 15 but not great enough to interfere with the operation of diaphragm 15. When chamber 20 has been placed under pressure the opening thereto is closed'in any suitable manner as by a drop of solder, as indicated at 36.

In the modified form illustrated in Figures 4 to 9, only one diaphragm member is used and a coiled spring is utilized for maintaining the diaphragm in normal or open position. An inverted cone-shaped casingy 38 is provided in its upper end with a diaphragm 39 thereby forming a pressure chamber 40. A fitting 41 is secured to the top wall 42 of casing 38 and is provided with an outlet connection 43 for dischargingthe fluid'from pressure chamber 40. Fitting 41 4tubular fitting 45 in the lower end of which is threaded an inlet connection. 46 controlled by a valve 47 seated therein. he upper end of tubular fitting extends u wardly within casing.. 38 and slidably arranged therein is the lower end of a sleeve 48, the upper end of which is secured to diaphragm 39. This sleeve is internally threaded for receiving a shortl tubular section 49. A valve stem 50 extends downwardly through sleeve 48 and tubular fitting .'45 and is provided with an extension 51, the lower end of which is adapted to engage the upper end of valve 47. The upper end of said valve stem is provided with an enlarged head 52 which is exteriorly threaded for engagement with the internal thread of tubular section 4 9.

A plug 54 is screw-threaded in said tubular section and is designed to engage the upper endfof the enlarged portion 52 and lock valve stem 50 in position. Valve stem 5() is provided with a laterally opening bore 55 which communica-tes with a longitudipass from .the inlet connection 46 through duct 56 upwardly into the pressure chamber 40. A coiled spring 56a .is arranged in fitting 45 and engages the lower end of slidable tubular member 48 and tends to maintain diaphragm 39 in its expanded or normal position. When in this position the lower end of extension 51 is moved away from valve 47 thereby permitting said valve to be unseated by the fluid pressure whereby fluid may pass from the inlet connection 46 through duct 56 into pressure chamber 40. When the pressure in this chamber reaches :nally disposed duct 5 6v formed in said stem and plug 54 is provided with a longitudinally disposed aperture whereby fluid may a predetermined degree, diaphragm 39 is operated causing sleeve member 48 to move downwardly against the influence of spring 56a and compressing the latter and causing the extension 51 to engage valve 47 and seat it in inlet connection 46 thereby closing the latter.

A fluid contained in pressure chamber 40 is'discharged through outlet connect-ion 43 and when the pressure in said chamber falls below a certalndegree, diaphragm 39 assumes its normal position, thereby releasing valve 47 and permittingifluid under pressure to enter pressure chamber 40.

Cil

In order to maintainva fluid tight seal between the stationary fitting and the movable sleeve 48 bellows 57 is arranged in casing 38 and the upper end of said bellows is lixed to sleeve 48 while the lower end is secured to litting 45.

The device'may be regulated by` adjustiig a tubular section 49 in sleeve 48 and by justing valve stem 50 in tubular section 49. In order to prevent movement of tubular section 49 when the enlarged head 52 of valve stem 50 is turned, the pitch of the internal thread of tubular section 49 and of the thread onthe enlarged head 52 is diderent from the pitch of the external thread of tubular section 49. In the present instance, the internal thread of tubular section 49 is liner relative to the external thread of said section, which external thread is comparatively coarse. Thus the accidental displacement of valve stem 50 is safeguarded against and I am enabled to obtain accurate adjustments.

A pressure reducing device of my improved construction contains but few parts thereby eliminating the danger of the device .getting out of order, is adjustable lso as to regulate the pressure, and is automatic in its action.

I claim:

1. A pressure controlling device comprising a casing provided at one end with a high pressure chamber and at its opposite end with a receiving chamber, said chambers being provided with yielding inner walls of proportionate diameter, a sleeve secured at its end to said yielding walls, an outlet connection leading from said receiving chamber, an inlet connection leading to said receiving chamber, a valve controlling one of said connections, and a valve stem adjustably arranged in said sleeve and in o erative engagement with said valve, said stem being provided with a bore connecting said chambers whereby when fluid pressure in said pressure chamber reaches a predetermined degree said yielding walls cause the stem to operate said valve.

2. A pressure controlling device comprising a casing provided at one end with a high pressure chamber and at its opposite end with a receiving chamber, said chambers being provided with yielding inner walls of proportionate diameters, a sleeve secured at its end to said yielding walls, an outlet connection leading from said receiving chamber, an inlet connection leading to said receiving chamber, a valve controlling one of said connections, a valve stem' adjustably arranged in said sleeve and. in operative engagement with said valve, said stem being rovided with a bore connecting said chambers whereby when fluid pressure in said pressure chamber reaches a4 predetermined degree said yielding walls cause the stem to operate said valve, and means for locking the stem in adjustedposition.

3. A pressure reducing device comprising a casing provided at one end with a high pressure chamber .and atits opposite end with a receiving chamber,'the inner walls of said chambers being yielding and of different diameters, an intermediate chamber arranged `in said casing and adapted to be placed under suitable fluid pressure to partially balance said yielding walls, a sleeve .secured at its ends to said yielding walls, a

stem screw-seated in said sleeve and provided wlth a passageway for connectmg said receiving chamber and said high pressure` provided vwith a duct for conveying the fluid from the receiving chamber to said pressure chamber, an inlet connection for said receiving chamber and a valve for closing said inlet connection and operable 'by said stem when the diaphragm in said pressure chamberl is actuated.

5. A pressure reducing device comprising a casing provided with a pressure chamber and a receiving chamber of unequal dialneters, each of said chambers being provided 'with an inner yielding wall or diaphragm,

a tubular section secured at its ends to said vwalls, an adjustable stem in said section and provided with a duct-for conveying the fluid from the receiving chamber to said pressure chamber, an inlet connection for said receiving chamber and a valve for closing said inlet connection and operable by said stem when the diaphragm in said pressure chamber. is actuated, and means in the outer wall of said pressure chamber for providing access to said adjustable valve stem. In testimony whereof I hereunto affix my signature this 2nd day of April, 1923.

JOHN O. CARREY. 

